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Publication numberUS5607909 A
Publication typeGrant
Application numberUS 08/381,373
Publication dateMar 4, 1997
Filing dateJan 31, 1995
Priority dateJan 31, 1995
Fee statusLapsed
Publication number08381373, 381373, US 5607909 A, US 5607909A, US-A-5607909, US5607909 A, US5607909A
InventorsPhilip J. Kefauver, Fernando R. Toll ens, Scott W. Syfert
Original AssigneeThe Procter & Gamble Company
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Personal cleansing freezer bar with tailored fatty acid soap
US 5607909 A
Abstract
The present invention relates to a mild, lathering personal cleansing freezer bar composition by weight of the bar comprising: from 30 to 85 parts of tailored fatty acid soap, from 0 parts to 30 parts lathering synthetic detergent/surfactant, and from 15 to 35 parts of water. The tailored fatty acid soap comprises:
I. from 50% to 85% is saturated fatty acid soap selected from the group consisting of: myristic, palmitic, and stearic acid soaps and mixtures thereof; and
II. from 15% to 50% by weight of total soap is selected from the group consisting of: oleic (C18:1) and lauric acid (C12) soaps; and
wherein said tailored fatty acid soap is a mixture of 65% to about 95% sodium soap and from 5% to about 35% magnesium soap.
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Claims(10)
What is claimed is:
1. A mild, lathering personal cleansing freezer bar composition by weight of the bar comprising: frown 30 to 85 parts tailored fatty acid soap, from 3 parts to 30 parts synthetic surfactant, and from 15 to 35 parts of water; wherein said tailored fatty acid soap by weight of total soap comprises:
I. from 50% to 85% of total soap is saturated fatty acid soap selected from the group consisting of: myristic, palmitic, and stearic acid soaps and mixtures thereof; and
II. from 15% to 50% by weight of total soap is: oleic (C18:1) and lauric acid (C12) soaps and minor fatty acid soaps selected from the group consisting of: C8, C10, C18:2 ; and mixtures thereof; and
wherein said lauric and oleic soaps have a ratio of 0.1:1 to 3:1 and wherein said tailored fatty acid soap mixture is about 65% to about 95% sodium soap and from about 5% to about 35% magnesium soap, and wherein said freezer bar composition is essentially free of potassium soap.
2. The mild, lathering personal cleansing freezer bar composition of claim 1 wherein said composition is from 50 to 75 parts said tailored fatty acid soap, from 3 parts to 30 parts said synthetic surfactant, and from 20 to 35 parts of water; wherein said tailored fatty acid soap by weight of total soap comprises:
I. from 55% to 75% of total soap is said saturated fatty acid soap selected from the group consisting of: myristic, palmitic, and stearic acid soaps and mixtures thereof; and
II. from 20% to 45% by weight of total soap is: said oleic (C18:1) and lauric acid (C12) soaps and minor fatty acid soaps selected from the group consisting of: C8, C10, C18:2; and mixtures thereof; and
wherein said tailored fatty acid soap mixture is about 75% to about 95% said sodium soap and from about 8% to about 25% said magnesium soap.
3. The mild, lathering personal cleansing freezer bar composition of claim 2 wherein said tailored fatty acid soap by weight of total soap comprises:
I. from 60% to 70% of total soap is said saturated fatty acid soap selected from the group consisting of: myristic, palmitic, and stearic acid soaps and mixtures thereof, and
II. from 25% to 40% by weight total soap is: said oleic (C18:1) and lauric acid (C12) soaps and minor fatty acid soaps selected from the group consisting of: C8, C10, C18:2; and mixtures thereof; and
wherein said tailored fatty acid soap mixture is about 80% to about 90% said sodium soap and from about 10% to about 20% said magnesium soap.
4. The mild, lathering personal cleansing freezer bar composition of claim 1 wherein said Na soap level is from 65% to 90%, by weight of said total soap; and the Mg soap level is from 10% to 25%, by weight of the total soap; and wherein the bar comprises:
A. from 60 parts to 85 parts, of said total tailored fatty acid soap;
B. from 1 parts to 15 parts of free fatty acid;
C. from 20 parts to 30 parts, of said water;
D. from 8 parts to 15 parts said synthetic surfactant.
5. The mild, lathering personal cleansing freezer bar composition of claim 1 wherein said lauric and oleic soaps has a ratio of about 0.2:1 to about 0.4:1.
6. The mild, lathering personal cleansing freezer bar composition of claim 1 wherein said lauric and oleic soaps ratio of is about 0.7:1 to about 2:1.
7. The mild, lathering personal cleansing freezer bar composition of claim 1 wherein said lauric and oleic soaps ratio of is about 0.7:1 to about 2:1; and wherein said bar contains from 30 to 85 parts said tailored fatty acid soap, from 5 parts to 20 parts said synthetic surfactant, and from 20 to 30 parts of water and wherein said tailored fatty acid soap mixture is about 80% to about 90% sodium soap and from about 5% to about 20% magnesium soap.
8. A mild, lathering personal cleansing freezer bar composition by weight of the bar comprising: from 30 to 85 parts tailored fatty acid soap, from 5 parts to 15 parts synthetic surfactant, and from 20 to 35 parts of water; wherein said tailored fatty acid soap by weight of total soap comprises:
I. from 50% to 85% is saturated fatty acid soap selected from the group consisting of: myristic, palmitic, and stearic acid soaps and mixtures thereof; and
II. from 15% to 50% by weight of total soap is: oleic (C18:1) and lauric acid (C12) soaps and minor fatty acid soaps selected from the group consisting of: C8, C10, C18:2; and mixtures thereof; and
wherein said lauric and oleic soaps have a ratio of 0.7:1 to about 1:1 and wherein said tailored fatty acid soap mixture is about 65% to about 95% sodium soap and from about 10% to about 20% magnesium soap; and wherein said bar is essential free of potassium soap.
9. A mild, lathering personal cleansing freezer bar composition by weight of the bar comprising: from 30 to 85 parts tailored fatty acid soap, from 3 parts to 30 parts synthetic surfactant, and from 5 to 35 parts of water; wherein said tailored fatty acid soap by weight of total soap comprises:
I. from 50% to 85% is saturated fatty acid soap selected from the group consisting of: myristic, palmitic, and stearic acid soaps and mixtures thereof; and
II. from 15% to 50% by weight of total soap is: oleic (C18:1) and lauric acid (C12) soaps and minor fatty acid soaps selected from the group consisting of: C8, C10, C18:2 ; and mixtures thereof; and
wherein said lauric and oleic soaps have a ratio of about 0.2:1 to about 0.4:1 and wherein said tailored fatty acid soap mixture is about 65% to about 95% sodium soap and from about 5% to about 35% magnesium soap, and wherein said freezer bar composition is essentially free of potassium soap.
10. A mild, lathering personal cleansing freezer bar composition by weight of the bar comprising: from 30 to 85 parts tailored fatty acid soap, from 3 parts to 30 parts synthetic surfactant, and from 20 to 35 parts of water; wherein said tailored fatty acid soap by weight of total soap comprises:
I. from 50% to 85% is saturated fatty acid soap selected from the group consisting of: myristic, palmitic, and stearic acid soaps and mixtures thereof; and
II. from 15% to 50% by weight of total soap is: oleic (C18:1) and lauric acid (C12) soaps and minor fatty acid soaps selected from the group consisting of: C8, C10, C18:2 ; and mixtures thereof: and
wherein said lauric and oleic soaps have a ratio of about 0.7:1 to about 2:1 and wherein said tailored fatty acid soap mixture is about 65% to about 95% sodium soap and from about 5% to about 35% magnesium soap and wherein said freezer bar composition is essentially free of potassium soap.
Description
TECHNICAL FIELD

This invention relates to personal cleansing freezer bar soaps.

BACKGROUND OF THE INVENTION

The cleansing of skin with surface-active cleansing preparations has become a focus of great interest. Many people wash and scrub their skin with various surface-active preparations several times a day. An ideal skin cleanser should cleanse the skin gently, causing little or no irritation, without defatting or overdrying the skin or leaving it taut after frequent routine use. Most lathering skin cleansers, liquids and bars, fail in this respect.

Synthetic detergent bars, frequently referred to as "syndet bars," are well known and are becoming increasingly popular. However, widespread replacement of soap bars by syndet bars has not so far been possible for a variety of reasons, primarily the different physical characteristics of syndet bars as compared to soap bars, e.g., processability, cost, smear or bar messiness, lather and rinse negatives.

The skin cleansing art is much more complex in our time. To improve skin cleansing mildness without processing and/or lather negatives, can be an unobvious and delicate balancing act.

It will be appreciated that rather stringent requirements for skin cleansers limit the choice of surface-active agents and final formulations represent some degree of compromise. Mildness is often obtained at the expense of effective cleansing and lathering. Conversely, mildness may be sacrificed for either preferred lathering characteristics, rinse feel, bar firmness, product stability, or all of the above. To provide an improvement or fix a problem in this art is usually more than mere optimization of the known art. There is an infinite number of ways to blend and tailor fatty acid soaps and synthetic surfactants. Which tailored soap blend is useful for a particular product or process is not always predictable.

A search of the bar soap literature will attest to the fact that those skilled in the art are still making improvements in the skin cleansing art.

SUMMARY OF THE INVENTION

The present invention relates to a mild, lathering personal cleansing freezer bar composition by weight of the bar comprising: from 30 to 85 parts of tailored fatty acid soap, from 0 parts to 30 parts lathering synthetic detergent/surfactant, and from 15 to 35 parts of water. The tailored fatty acid soap comprises:

I. from 50% to 85% is saturated fatty acid soap selected from the group consisting of: myristic, palmitic, and stearic acid soaps and mixtures thereof, and

II. from 15% to 50% of lathering soap selected from the group consisting of: oleic (C18:1) and lauric acid (C12) soaps including from 0 to 10% minor fatty acid soaps selected from the group consisting of: C8, C10, C18:2; and mixtures thereof, and

wherein said tailored fatty acid soap is a mixture of 65% to about 95% sodium soap and from 5% to about 35% magnesium soap.

DETAILED DESCRIPTION OF THE INVENTION

The present invention relates to a mild, lathering personal cleansing tailored freezer bar composition comprising: from 30 to 85 parts (preferably 50 parts to 75 parts) of tailored fatty acid soap and from 15 to 35 parts (preferably 20 parts to 35 parts or preferably 20 parts to 30 parts) of water. The tailored fatty acid soap comprises:

I. from 50% to 85% (preferably 55% to 75%, or 60% to 70%) saturated fatty acid soap selected from the group consisting of: myristic, palmitic, and stearic acid soaps and mixtures thereof; and

II. from 15% to 50% (preferably 20% to 45%, or 25% to 40%) lathering soap selected from the group consisting of: oleic (C18:1) and lauric acid (C12) soaps including from 0 to 10% minor fatty acid soaps selected from the group consisting of: C8, C10, C18:2; and mixtures thereof; and

wherein the soap is 65% to about 95% (preferably 75% to 95%, or 80% to 90%) sodium soap and from 5% to about 35% (preferably 8% to 25% or 10% to 20%) magnesium soap.

A preferred freezer bar composition comprises by weight of the bar: from 20 to 35 parts water, preferably 23 to 30 parts water. Freezer bar soaps are made using a process generally disclosed in U.S. Pat. No. 3,835,058, White, issued on Sep. 10, 1974. The following commonly assigned references are incorporated herein by reference: Tollens et al, U.S. patent application Ser. No. 07/959,876 filed Oct. 13, 1992, allowed; Moroney, et al, U.S. Pat. No. 5,264,144. Issued on Nov. 23, 1993, and French, et al, U.S. Pat. No. 5,264,145; issued on Nov. 23, 1993.

The tailored freezer bar further contains: from 8 to 35 parts of said (II) lathering lauric and oleic soaps and minor soaps; wherein said lauric and oleic soaps having a ratio of 0.1:1 to 3:1. A highly preferred tailored fatty acid soap comprises lauric and oleic soaps at a ratio of about 0.2:1 to about 0.4:1. Another highly preferred tailored fatty acid soap surprisingly comprises lauric and oleic soaps at a ratio of about 0.6:1 to about 2:1; more preferably from 0.7:1 to about 1:1.

It is important to selectively balance the amount of lauric and oleic soaps to achieve good lather and mildness. More lather is realized at the higher end of the level (35 parts) and better mildness is realized at the lower (8 parts) end of the level.

The tailored bar further contains: from about 5 parts to 30 parts (preferably 9 parts to 20 parts) of said oleic soap with from 2 to 15 parts (preferably 5 parts to 12 parts) being said lauric soap and from zero to about 7 parts (preferably 1 part to 5 parts) of said minor (C8, C10, C18:2) soaps.

The tailored fatty acid soap preferably comprises sodium and magnesium soaps having a ratio of 10:1 to 3:1.

A minor amount of potassium soap can be used; but in some highly preferred bar potassium soap is avoided.

Milled and framed bars are made using processes generally disclosed in Small et al. U.S. Pat. No. 4,673,525, 4,812,258; Medcalf et al. U.S. Pat. No. 4,820,447, and U.S. Pat. No. 5,328,632, Redd et al., issued on Jul. 12, 1994, incorporated herein by reference. The above methods of making soap bars can be substantially different in terms of levels of ingredients, equipment and processing conditions. Redd, et al., U.S. Pat. No. 5,328,632, issued on Jul. 12, 1994.

The levels, parts, percentages and ratios herein are by weight unless otherwise specified.

Note that the levels of the tailored soaps are expressed herein both in terms of weight percent (wt. %) of the total soap as well as parts by weight of the bar.

The term "parts" is used to denote the level of an ingredient "by weight of the bar." E.g. the present invention relates to a mild, lathering personal cleansing soap bar composition "by weight of the bar" comprising: from 30 to 85 "parts" of tailored fatty acid soap, from 3 to 30 "parts" lathering synthetic detergent/surfactant and from 15 to 35 "parts" of water.

All numerical limits, ranges, ratios, etc., are approximations unless otherwise specified. Within the scope of the invention, there are several different preferred embodiments.

The terms "tailored fatty acid soap," "total soap" and "total fatty acid soap" as used herein are the same, unless otherwise specified.

The term "insoluble" soap as used herein means a soap less soluble than sodium myristate (C14). The magnesium soaps are insoluble. See Soap Solubility Table 1.

              TABLE 1______________________________________Solubility of Soaps, Molar, 25 C.    Na            K       Mg______________________________________C12      0.11          Freely  InsolubleC18:1    0.49          Freely  --C14       0.004        Freely  InsolubleC16      Insoluble     --      InsolubleC18      Insoluble     --      Insoluble______________________________________

The term "soap" as used herein includes the plural as well as the singular in terms of mixed ions and fatty acid chains unless otherwise specified.

The terms "coconut oil" (CNO); "palm kernel oil" (PKO); "palm oil stearin" (POS); and "tallow" (T) as used herein refers to a mixture of soaps having an approximate chain length distribution as usually defined in the literature; unless otherwise specified.

The term "triple pressed stearic" as used herein refers to fatty acids having an approximate chain length distribution of 55% palmitic and 45% stearic.

The term "relatively more soluble soap" as used herein means a soap of which the fatty chain length or level of unsaturation is such that it is more soluble than sodium myristate, or a soap that has the solubility on the order of sodium laurate or sodium oleate soaps.

The tailored fatty acid soap of this invention can be made in part by using pure chain fatty acids, or by using the proper levels and ratios of common fatty acid mixtures such as coconut, palm kernel oil, palm oil stearin, tallow, and triple pressed stearic. The preferred levels and ratios can vary with the levels of cation mixtures.

Free Fatty Acids

Free fatty acids are preferably used in the present invention. They correspond with the fatty acids used to make the soaps. The free fatty acids affect the lathering characteristics of the bars prepared in accordance with the present invention. The free fatty acids increase the creaminess of the lather; the bars of this invention can show a mildness improvement over bars without free fatty acids. Fatty acids provide an emollient effect which tends to soften the skin or otherwise improve feel-on-skin characteristics and scavenge any excess alkalinity.

Synthetic Detergent Surfactant

Bars contain synthetic detergent surfactant, preferably a mild lathering synthetic detergent surfactant for the enhancement of the tailored base soap characteristics of improved rinse feel, curd dispersion, lathering and mildness through substitution for more harsh soluble soaps.

The synthetic detergent surfactant is typically selected from the group consisting of: anionic, nonionic, amphoteric and zwitterionic synthetic detergents. Both low and high lathering and high and low water-soluble surfactants can be used in the bar compositions of the present invention. Suds boosting synthetic detergent surfactants and/or synthetic detergent surfactants that are known as good dispersants for soap curds that are formed in hard water, are particularly desirable.

Examples include the water-soluble salts of organic, sulfonic acids and of aliphatic sulfuric acid esters, that is, water-soluble salts of organic sulfuric reaction products having in the molecular structure an alkyl radical of from 10 to 22 carbon atoms and a radical selected from the group consisting of sulfonic acid and sulfuric acid ester radicals.

Synthetic sulfate detergents of special interest are the normally solid alkali metal salts of sulfuric acid esters of normal primary aliphatic alcohols having from 10 to 22 carbon atoms. Thus, the sodium and potassium salts of alkyl sulfuric acids obtained from the mixed higher alcohols derived by the reduction of tallow or by the reduction of coconut oil, palm oil, palm kernel oil, palm oil stearin, babassu kernel oil or other oils of the lauric oil group can be used herein.

Other aliphatic sulfuric acid esters which can be suitably employed include the water-soluble salts of sulfuric acid esters of polyhydric alcohols incompletely esterified with high molecular weight soap-forming carboxylic acids. Such synthetic detergents include the water-soluble alkali metal salts of sulfuric acid esters of higher molecular weight fatty acid monoglycerides such as the sodium and potassium salts of the coconut oil fatty acid monoester of 1,2-hydroxypropane-3-sulfuric acid ester, sodium and potassium monomyristoyl ethylene glycol sulfate, and sodium and potassium monolauroyl diglycerol sulfate.

The synthetic surfactants and other optional materials useful in conventional cleaning products are also useful in the present invention. In fact, some ingredients such as certain hygroscopic synthetic surfactants which are normally used in liquids and which are very difficult to incorporate into normal cleansing bars are very compatible in the bars of the present invention. Thus, essentially all of the known synthetic surfactants which are useful in cleansing products are useful in the compositions of the present invention. The cleansing product patent literature is full of synthetic surfactant disclosures.

It is noted that surfactant mildness can be measured by a skin barrier destruction test which is used to assess the irritancy potential of surfactants. In this test the milder the surfactant, the less the skin barrier is destroyed. Skin barrier destruction is measured by the relative amount of radio-labeled water (3H-H2O) which passes from the test solution through the skin epidermis into the physiological buffer contained in the diffusate chamber. This test is described by T. J. Franz in the J. Invest. Dermatol., 1975, 64, pp. 190-195; and in U.S. Pat. No. 4,673,525, Small et al., issued Jun. 16, 1987, incorporated herein by reference. These references disclose a mild alkyl glyceryl ether sulfonate (AGS) surfactant based synbar comprising a "standard" alkyl glyceryl ether sulfonate mixture and define the criteria for a "mild surfactant." Barrier destruction testing is used to select mild surfactants. Some preferred mild synthetic surfactants are disclosed in the above Small et al. and Rys et al. patents. Some specific examples of preferred surfactants are used in the Examples herein.

Some examples of good mild, lather-enhancing, synthetic detergent surfactants are, e.g., sodium lauroyl sarcosinate, alkyl glyceryl ether sulfonate (AGS), sulfonated fatty esters, and sulfonated fatty acids. Numerous examples of other surfactants are disclosed in the patents incorporated herein by reference. They include other alkyl sulfates, anionic acyl sarcosinates, methyl acyl taurates, N-acyl glutamates, acyl isethionates, alkyl sulfosuccinates, alkyl phosphate esters, ethoxylated alkyl phosphate esters, trideceth sulfates, protein condensates, mixtures of ethoxylated alkyl sulfates and alkyl amine oxides, betaines, sultaines, and mixtures thereof. Included in the surfactants are the alkyl ether sulfates with 1 to 12 ethoxy groups, especially ammonium and sodium lauryl ether sulfates.

Alkyl chains for these other surfactants are C8-C22, preferably C10-C18. Alkyl glycosides and methyl glucose esters are preferred mild nonionics which can be mixed with other mild anionic or amphoteric surfactants in the compositions of this invention. Alkyl polyglycoside detergents are useful lather enhancers.

Normally the soap/synthetic bars are prepared to contain a ratio of soap to synthetic detergent of from about 3:1 to about 25:1. The choice of suitable ratios will depend upon the particular synthetic detergent, the desired performance and physical characteristics of the finished bar, temperature, moisture and like processing considerations. A preferred ratio is from about 4:1 to about 7:1.

The lathering surfactant is defined herein as a synthetic surfactant or mixes thereof that when combined has (have) an equilibrium surface tension of between 15 and 50 dynes/cm, more preferably between 20 and 45 dynes/cm as measured at the CMC (critical micell concentration) at 25 C. Some surfactant mixes can have surface tensions lower than of its components.

______________________________________TABLE OF SOME SYNTHETIC SURFACTANTSSURFACE TENSION*                     SurfaceSurfactant                tension(dynes/cm)                at CMC______________________________________AnionicsSodium Dodecane Sulfonate 43Potassium Dodecane Sulfonate                     38Sodium Dodecyl Sulfate    40Sodium Tetradecyl Sulfate 35Sodium hexadecyl Sulfate  37Sodium Dodeceth-2 Sulfate 42Sodium Decyl Benzene Sulfonate                     48Sodium Dodecyl Benzene Sulfonate                     47Sodium Hexadecyl Benzene Sulfonate                     45CationicsTetradecyl Trimethyl Ammonium Bromide                     41Dodecyl Trimethyl Ammonium Methane Sulfonate                     39ZwitterionicsDodecyl Betaine           33Hexadecyl Betaine         35Dodecyl Benzyl methyl Ampho Acetate                     33Nonionics1,2 Dodecyldiol           231,3 Pentadecyldiol        27Hexeth-6                  32Deceth-6                  30Dodeceth-3                28Dodeceth-12               40Hexadeceth-6              32Hexadeceth-21             45Nonoxynol-10              31Nonoxynol-30              41Dimethicone copolyol      21-22______________________________________ *As calculated from Surfactants and Interfacial Phenomena by Rosen, Wiley 1988)

______________________________________TABLE OF SOME PREFERRED SURFACTANTSSURFACE TENSION**Surfactant        Surface tension (dynes/cm)______________________________________C12-C14 Glycerylether sulfonate             47Sodium Lauryl Isethionate             42Sodium Coco Isethionate             42Sodium Stearyl Isethionate             72Sodium Ether (3) Sulphate             47Sodium Coco Taurate             43Sodium Lauryl Sarcosinate             42______________________________________ **Measured on Kruss BP10 Dynamic surface tensiometer, these measurements were not equilibrium, nor at the CMC. Equilibrium measurements are typically lower than Dynamic..

Anionic surfactants useful herein include acyl isethionates, acyl sarcosinates, alkylglycerylether sulfonates, methylacyl taurates, paraffin sulfonates, linear alkyl benzene sulfonates, N-acyl glutamates, alkyl sulfosuccinates, alpha sulfo fatty acid esters, alkyl ether carboxylates, alkyl phosphate esters, ethoxylated alkyl phosphate esters, alpha olefin sulphonate, the alkyl ether sulfates (with 1 to 12 ethoxy groups), and mixtures thereof, wherein said surfactants contain C8 to C22 alkyl chain. The anionic surfactant is more preferred at about 8 parts to about 30 parts, selected from the group consisting of acyl isethionate, acyl sarcosinates, alkyl sulfosuccinates, alkylglycerylether sulfonates, methylacyl taurates, alkyl ether sulfates, alkyl sulfates, alkyl phosphate esters and mixtures thereof, wherein said surfactants contain C8 to C18 alkyl chains and wherein the counterion is selected from the group consisting of: Na, K, NH4, N(CH2CH2OH)3.

Cationic synthetic surfactant cannot serve as the sole surfactant in this product, but are preferred as a co-surfactant at a lower level of from about 0.5 parts to about 6 parts, by weight. The more preferred types of cationic surfactants are selected from the group consisting: alkyl trimonium chloride and methosulfate, and dialkyldimonium chloride and methyl sulphate, and alkyl alkonium chloride and methyl suphate and mixtures thereof. These surfactants contain C12 to C24 carbon atoms per alkyl chain. The most preferred cationic is selected from the group consisting of stearylkonium chloride, stearyltrimonium chloride, Di-stearyl-dimonium chloride, and mixtures thereof.

Polymers

A highly preferred embodiment of the present invention contains a polymeric skin mildness aid. Polymeric skin mildness aids are disclosed in the Small et al. and Medcalf et al. patents. (U.S. Pat. Nos. 4,673,525; 4,812,258; and 4,820,447 incorporated herein by reference.) The cationic synthetic polymers useful in the present invention are cationic polyalkylene imines, ethoxypolyalklene imines, and poly[N-[-3-(dimethylammonio)propyl]-N'-[3-(ethyleneoxyethylene dimethylammonio)propyl]urea dichloride] the latter of which is available from Miranol Chemical Company, Inc. under the trademark of Miranol A-15, CAS Reg. No. 68555-36-2.

Preferred cationic polymeric skin conditioning agents of the present invention are those cationic polysaccharides of the cationic guar gum class with molecular weights of 1,000 to 3,000,000. More preferred molecular weights are from 2,500 to 350,000. These polymers have a polysaccharide backbone comprised of galactomannan units and a degree of cationic substitution ranging from about 0.04 per anhydroglucose unit to about 0.80 per anhydroglucose unit with the substituent cationic group being the adduct of 2,3-epoxypropyltrimethyl ammonium chloride to the natural polysaccharide backbone. Examples are JAGUAR C-14-S, C-15 and C-17 sold by the successor of the Celanese Corporation. In order to achieve the benefits described in this invention, the polymer must have characteristics, either structural or physical which allow it to be suitably and fully hydrated and subsequently well incorporated into the soap matrix.

Other Ingredients

The bar soap compositions of the present invention can contain other additives commonly included in toilet bars such as perfumes, other fillers, sanitizing or antimicrobial agents, dyes, and the like.

Preservatives, e.g., sodium ethylenediaminetetraacetate (EDTA), generally at a level of less than 1 parts of the composition, can be incorporated in the cleansing products to prevent color and odor degradation. Antibacterials can also be incorporated, usually at levels up to 1.5 parts. The above patents disclose or refer to such ingredients and formulations which can be used in the bars of this invention, and are incorporated herein by reference.

Some bars of this invention contain at least about 1 parts of another bar ingredient selected from: moisturizers, colorants, solvents, fillers, polymeric skin feel and mildness aids, perfumes, preservatives, and mixtures thereof.

Compatible salt and salt hydrates can be incorporated into the formulation. Some preferred salts are sodium chloride, sodium sulfate, disodium hydrogen phosphate, sodium pyrophosphate, sodium tetraborate. Sodium chloride is kept below 2.0 parts by weight of the bar, preferably less than 1 parts.

EXAMPLES

The following Examples illustrate the practice of this invention and are not intended to be limiting. All percentages, parts and ratios herein are by weight unless otherwise specified. All levels and ranges, temperatures, results etc., used herein are approximations unless otherwise specified. The free fatty acids used in the examples are used at about the same ratio as that of the fatty acid soaps. The soaps are made in situ, unless otherwise specified. The levels of soaps are given as a total soap weight percent (wt. %), as well as parts by bar weight.

The exaggerated forearm wash test is a modified Lukacovic, Dunlap, Michaels, Visscher, and Watson: "Forearm wash test to evaluate the clinical mildness of cleansing products," J. Soc. Cosmet. Chem., 39, 355-366 (November/December 1988). One week of testing is used instead of two weeks.

              TABLE______________________________________THE PREFERRED FREEZER BAR                  Example ILevels:                In Bar    In Soap______________________________________C8-caprylic            1.2       2.11C10-capric             0.9       1.63C12-laurate            7.2       12.63C14-myristate          3.5       6.08C16-palmitate          26.2      45.71C18-stearate           8.2       14.37C18:1,2-oleate         9.7       17.01C18:2                  1.2       2.02Total Soap (%)                   100Total Soap Parts       57.78Water                  27Synthetic (AGS)        10NaCl                   0.77Perfume/color/etc.     0.5Free Caustic           noneFree Fatty Acid        3Miscellaneous          0.95Bar Parts   TOTAL      100C14;16;18   *          *         66.2C8;10;12;18:1       *          *         33.4As BarC8;10;12;18:1       *          19.1      *C18:1       *          9.7       *C12         *          7.2       *C8;10;18:2  *          4.2       *Counterion--Na        92 to 64   90.0--Mg         8 to 18   10.0Na:Mg       20 to 1    9.0C12/CI8:1   <.4 or >.7 0.74______________________________________

The freezer bar composition is set out above as Example 1. This bar is unique in that lathering is comparable to the prior art mild freezer bars but with better rinse feel and reduced bathtub ring.

The personal cleansing bars which are made with the carefully tailored fatty acid soap and with the mixed counterions (Mg and Na) and selected fatty acids of the present invention are surprisingly milder that comparable bars that are made with prior art base soaps. The bars of the present invention are good lathering. Their lathers are good rinse feel lathers. Their processability is good and their wear rates are good. Their smear rates are also good. The bars of the present invention cleanse the skin gently, causing little or no irritation and with less drying.

Patent Citations
Cited PatentFiling datePublication dateApplicantTitle
US4946618 *Dec 21, 1989Aug 7, 1990The Procter & Gamble CompanyToilet bar composition containing cationic guar gum
US5387362 *Oct 13, 1992Feb 7, 1995The Procter & Gamble CompanyPersonal cleansing bar with tailored base soaps with mixed counterions for improved mildness and processability without lather negatives
Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US5705462 *Oct 20, 1994Jan 6, 1998Henkel Kommanditgesellschaft Auf AktienBar soaps containing ether sulfates and oligoglycosides
US5750481 *Jan 17, 1996May 12, 1998Calgene, Inc.Soaps produced from high laurate canola oil-based fatty acids
US6042288 *Mar 2, 1998Mar 28, 2000Lever Brothers Company, Division Of Conopco, Inc.Synthetic detergent bar of given composition inserted inside a lightweight polymeric mesh sponge, enhances lather even in the presence of lather depressing emollients
US6706675Feb 20, 2003Mar 16, 2004The Dial CorporationPolyethylene glycol, glycerin and/or sorbitol, water, fatty acid
US7662761May 31, 2005Feb 16, 2010Conopco, Inc.fatty acid soap, surfactant selected from free fatty acids, polyalkylene oxides, glycerol alkanoates, and water; adding complex inducing multivalent ion to the fatty acid soap to form multivalent ion-soap complex
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Classifications
U.S. Classification510/152, 510/153, 510/491, 510/484
International ClassificationC11D10/04
Cooperative ClassificationC11D10/04
European ClassificationC11D10/04
Legal Events
DateCodeEventDescription
May 8, 2001FPExpired due to failure to pay maintenance fee
Effective date: 20010304
Mar 4, 2001LAPSLapse for failure to pay maintenance fees
Sep 26, 2000REMIMaintenance fee reminder mailed
Sep 5, 1995ASAssignment
Owner name: PROCTER & GAMBLE COMPANY, THE, OHIO
Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:KEFAUVER, PHILIP JOSEPH;TOLLENS, FERNANDO RAY;SYFERT, SCOTT WILLIAM;REEL/FRAME:007635/0237
Effective date: 19950131